Ultrasonic transducer and process to obtain high acoustic attenu

Details Ultrasonic transducer and process to obtain high acoustic attenu Ultrasonic transducer and process to obtain high acoustic attenu

1981-04-27

1983-05-03

Shoop, William M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310336, 264102, 264332, H04R 1700

Patent

active

043822010

ABSTRACT:
A high frequency ultrasonic transducer is improved by fabricating the tungsten-polyvinyl chloride composite, which backs the elements, in a specific manner. Small particle size tungsten powder and PVC powder are placed into a high pressure die. Standard processing of the powder mixture includes degasing followed by heating and compressing. To maximize the acoustic attenuation, the pressure applied to the mixture is maintained until it has cooled down. The composite is in a state of elastic compression and spontaneously expands when removed from the die, giving rise to the high levels of acoustic attenuation.

REFERENCES:
patent: 2881336 (1959-04-01), Elion
patent: 3376438 (1968-04-01), Colbert
patent: 3631271 (1971-12-01), Shimada
patent: 3794866 (1974-02-01), McElroy et al.
patent: 4205686 (1980-06-01), Harris et al.
patent: 4240003 (1980-12-01), Larson
Lees et al., "Acoustic Properties of Tungsten-Vinyl Composites", IEEE Transactions on Sonics and Ultrasonics, vol. SU-20, No. 1, Jan. 1973, pp. 1, 2.

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